package org.apache.commons.graph

import kotlinx.atomicfu.locks.synchronized

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

/**
 * A synchronized (thread-safe) [Graph] backed by the specified Graph.
 */
/**
 * Creates a new thread-safe instence of [SynchronizedMutableGraph].
 * @param g The [Graph] that has to be synchronized
 */
internal class SynchronizedMutableGraph<V, E>(
    private val mutableGraph: MutableGraph<V, E>
) : SynchronizedGraph<V, E>(mutableGraph), MutableGraph<V, E> {

    /**
     * {@inheritDoc}
     */
    override fun addEdge(head: V, e: E, tail: V) {
        synchronized(this) {
            mutableGraph.addEdge(head, e, tail)
        }
    }

    /**
     * {@inheritDoc}
     */
    override fun addVertex(v: V) {
        synchronized(this) {
            mutableGraph.addVertex(v)
        }
    }

    /**
     * {@inheritDoc}
     */
    override fun removeEdge(e: E) {
        synchronized(this) {
            mutableGraph.removeEdge(e)
        }
    }

    /**
     * {@inheritDoc}
     */
    override fun removeVertex(v: V) {
        synchronized(this) {
            mutableGraph.removeVertex(v)
        }
    }

}

fun<V,E> MutableGraph<V, E>.toSyncGraph(): MutableGraph<V, E> = SynchronizedMutableGraph(this)